The CAS number for standard industrial sulfur powder (elemental sulfur) is 7704-34-9.
Key Notes
- This CAS registry number applies to all physical forms of elemental sulfur, including ground powder, lump sulfur, sublimed sulfur and precipitated sulfur. CAS numbers are classified by chemical composition, not particle size, crystal form or physical state.
- It corresponds to pure elemental sulfur, the chemical substance that makes up nearly 100% of conventionally ground sulfur powder (dominated by the stable S₈ ring allotrope).
Distinction for Special Grades
Polymeric (insoluble) sulfur, a specialized linear-chain allotrope manufactured by quenching molten sulfur, has a separate CAS number 9035-99-8. However, this material is not produced by ordinary mechanical grinding and is not considered standard sulfur powder.
